WOKtenna

comatose · 08-07-2002

Ive been working on a parabolic dish antenna design
made from easily available hardware. In this experiment
im tring out a WOK. It doesnt work well gain wise, great
isolation, but the dish is just to deap. It has a poor f/D ratio.
I also need to design a real waveguide. This was more of
a brainstorming endevor, so there are no dimentions.
Feel free to email me if you have any ideas, such as something
shallower for a reflector. Or a feedhorn design that will
illuminate the edges well,center little, and not have signal bleed
outside of the dish.

f=scr(D)/16d
f/D with this thing is .25 at best, which totally sucks.

http://scootz.net/~travis/woktenna/

-comatose comatose@iniquitybbs.com

lincomatic · 08-07-2002

that's a pretty cool idea you have. if you go to a chinese grocery store they usually have lots of woks of different depths. i've seen pretty shallow ones. most of them are made of carbon steel, though, which rusts if you just get a drop of water on them, but sometimes you can find stainless too.

what are those plastic bits you are using? are they custom? i've never seen parts like that.

comatose · 08-08-2002

A new wok is way to expensive, i got this one for $15
(this is the lid btw) the wok itself has a heating element
and a big flat spot. The radome is made from pvc parts
that i just cut and machined to fit together a certain way.
The feedhorn is just a patch antenna that i designed.
Theres metal tape on the inside of the radome which i was
hopeing would act as a waveguide, but with the focal point
so low i think it just blocked rf.

coma

comatose · 08-08-2002

http://scootz.net/~travis/crazy/P1010005.JPG
http://scootz.net/~travis/crazy/P1010006.JPG
http://scootz.net/~travis/crazy/P1010007.JPG

heres the WOK as i bought it.
kittens not included.

Thorn · 08-08-2002

Quote:

Originally posted by comatose
kittens not included.

It's been around a while on the 'net, but:
http://www.kanyak.com/ckettle.html

sparafina · 08-08-2002

This is too hilarious. The backfire design from Finland uses a tin baking dish for a reflector. I was fooling around with my g.net omni and I was getting a terrible signal so I used the lid from a room service plate as a groundplane.

If you're looking for inexpensive cookware for experimenting, AceMart is a national restaurant supplier chain that has stores in a lot of cities.

lincomatic · 08-08-2002

the woks in the chinese groceries go for about $5-$15 new. for stainless, about $20. also, most of them are completely round - no flat spot on the bottom, because they're designed to be mounted on a ring to elevate them.

lincomatic · 08-08-2002

Quote:

Originally posted by comatose
http://scootz.net/~travis/crazy/P1010005.JPG
http://scootz.net/~travis/crazy/P1010006.JPG
http://scootz.net/~travis/crazy/P1010007.JPG

heres the WOK as i bought it.
kittens not included.

those links are dead

lincomatic · 08-08-2002

Quote:

Originally posted by sparafina
This is too hilarious. The backfire design from Finland uses a tin baking dish for a reflector. I was fooling around with my g.net omni and I was getting a terrible signal so I used the lid from a room service plate as a groundplane.

If you're looking for inexpensive cookware for experimenting, AceMart is a national restaurant supplier chain that has stores in a lot of cities.

i saw a page a while back about a guy putting a frying pan behind his lucent omni to gain a few db

bwsaloum · 08-08-2002

Quote:

Originally posted by lincomatic

i saw a page a while back about a guy putting a frying pan behind his lucent omni to gain a few db

Funny you should mention that... I'm working on a design that involves one of those kiddie pools, about 200 yards of aluminimum foil and a broom stick... I'm think it might be good for a couple db's

mshimek · 08-08-2002

Anyone heard from the guy in England who was making an antenna out of a 55 gallon steel drum, mounted in the back of a pickup truck?

sparafina · 08-08-2002

Quote:

Originally posted by mshimek
Anyone heard from the guy in England who was making an antenna out of a 55 gallon steel drum, mounted in the back of a pickup truck?

It was joke

comatose · 08-08-2002

Is anyone going to post anything intelligent?
These jokes arnt even about parabolic reflectors.
*sigh*

coma

comatose · 08-08-2002

http://www.mit.edu/people/mwpstr/foto/lfocus.htm

thats pretty interesting.

comatose · 08-08-2002

http://solarcooking.org/parabolic-from-flat-sheet.htm

design for making a parabola outa something flat.
good stuff.

08-07-2002	#1 (permalink)
comatose Registered Member Join Date: Apr 2002 Location: no Posts: 42	WOKtenna Ive been working on a parabolic dish antenna design made from easily available hardware. In this experiment im tring out a WOK. It doesnt work well gain wise, great isolation, but the dish is just to deap. It has a poor f/D ratio. I also need to design a real waveguide. This was more of a brainstorming endevor, so there are no dimentions. Feel free to email me if you have any ideas, such as something shallower for a reflector. Or a feedhorn design that will illuminate the edges well,center little, and not have signal bleed outside of the dish. f=scr(D)/16d f/D with this thing is .25 at best, which totally sucks. http://scootz.net/~travis/woktenna/ -comatose comatose@iniquitybbs.com

08-07-2002	#2 (permalink)
lincomatic Squaaawk! WiFi! WiFi! Join Date: Apr 2002 Location: Tinsel Town Posts: 1,682	that's a pretty cool idea you have. if you go to a chinese grocery store they usually have lots of woks of different depths. i've seen pretty shallow ones. most of them are made of carbon steel, though, which rusts if you just get a drop of water on them, but sometimes you can find stainless too. what are those plastic bits you are using? are they custom? i've never seen parts like that. __________________ ~lincomatic

08-08-2002	#7 (permalink)
lincomatic Squaaawk! WiFi! WiFi! Join Date: Apr 2002 Location: Tinsel Town Posts: 1,682	the woks in the chinese groceries go for about $5-$15 new. for stainless, about $20. also, most of them are completely round - no flat spot on the bottom, because they're designed to be mounted on a ring to elevate them. __________________ ~lincomatic

08-08-2002	#11 (permalink)
mshimek Chile-Head Stumbler Join Date: Apr 2002 Location: Wi-Fi Wonderland Posts: 57	Drum antenna Anyone heard from the guy in England who was making an antenna out of a 55 gallon steel drum, mounted in the back of a pickup truck?

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08-08-2002	#3 (permalink)
comatose Registered Member Join Date: Apr 2002 Location: no Posts: 42	A new wok is way to expensive, i got this one for $15 (this is the lid btw) the wok itself has a heating element and a big flat spot. The radome is made from pvc parts that i just cut and machined to fit together a certain way. The feedhorn is just a patch antenna that i designed. Theres metal tape on the inside of the radome which i was hopeing would act as a waveguide, but with the focal point so low i think it just blocked rf. coma

08-08-2002	#4 (permalink)
comatose Registered Member Join Date: Apr 2002 Location: no Posts: 42	http://scootz.net/~travis/crazy/P1010005.JPG http://scootz.net/~travis/crazy/P1010006.JPG http://scootz.net/~travis/crazy/P1010007.JPG heres the WOK as i bought it. kittens not included.

08-08-2002	#6 (permalink)
sparafina Registered Member Join Date: May 2002 Location: TX,MD,NY Posts: 1,430	This is too hilarious. The backfire design from Finland uses a tin baking dish for a reflector. I was fooling around with my g.net omni and I was getting a terrible signal so I used the lid from a room service plate as a groundplane. If you're looking for inexpensive cookware for experimenting, AceMart is a national restaurant supplier chain that has stores in a lot of cities.

08-08-2002	#13 (permalink)
comatose Registered Member Join Date: Apr 2002 Location: no Posts: 42	Is anyone going to post anything intelligent? These jokes arnt even about parabolic reflectors. sigh coma

08-08-2002	#14 (permalink)
comatose Registered Member Join Date: Apr 2002 Location: no Posts: 42	http://www.mit.edu/people/mwpstr/foto/lfocus.htm thats pretty interesting.

08-08-2002	#15 (permalink)
comatose Registered Member Join Date: Apr 2002 Location: no Posts: 42	http://solarcooking.org/parabolic-from-flat-sheet.htm design for making a parabola outa something flat. good stuff.